Manual

Chapter 12
Overtravels and Programmable Zones
12-13
Tool motion stops during overtravel conditions that occur from 3 causes:
Cause: Description:
Hardware overtravel theaxes reacha travellimit, usually set bya limit switchor sensor
mounted on the axis. Hardware overtravelsare alwaysactive.
Software overtravel commands cause theaxis topass asoftware travellimit. Software
overtravels areactive onlyafter theaxis has beenhomed providedthe
feature has been activatedin AMPby thesystem installer.
Programmable zone
overtravel
The tool reached atravel limit establishedby independent
programmable areas. Programmable Zonesare activatedthrough
programming the appropriate G-code.
In all cases, the control issues an error message.When an overtravel
condition occurs, all axis motion stops, the control goes into cycle stop and
one of the these error messages appears.
Error Message: Description:
HARDWAREOVERTRAVEL
(-) BY AXIS(X)
indicates that thespecified axishas trippedeither the + or -
hardware limit switch mounted on themachine.
SOFTWAREOVERTRAVEL
(+) BY AXIS(X)
indicates that thespecified axishas enteredthe overtravel
area defined by thesoftware overtravellimits ineither a
positive or negative direction.
VIOLATION OF ZONE(2) BY
AXIS (X)
indicates that atool hasreached thespecified axisovertravel
area defined by eitherprogrammable zone2 or 3.
When an overtravel of any type occurs, axes cannot move in the same
direction as the feed causing the overtravel. Only axis motion in the
reverse direction is possible.
How a hardware overtravel condition is reset depends on the E-Stop circuit
design and the way PAL was programmed by your system installer.
To reset a software or programmable zone overtravel condition:
1. Determine whether the control is in E-Stop. If it is not, go to step 4.
2. Eliminate any other possible conditions that may have caused an
emergency stop, then make sure that it is safe to reset the emergency
stop condition.
3. Press the <E-STOP RESET> button to reset the emergency stop
condition. If the E-Stop does not reset, it is a result of some cause
other than overtravel.
4. Make sure it is safe to move the axis away from the overtravel limit.
5. Use any of the jog features described on page 4-1 except homing, to
manually move the axis away from the limit.
END OF CHAPTER
12.5
Resetting Overtravels